/* huutu.vn — component styles */
:root{--nav-h:64px}
body{padding-top:var(--nav-h)}
/* NAV */
.nav{position:fixed;inset:0 0 auto;height:var(--nav-h);z-index:80;background:color-mix(in oklab,var(--bg) 82%,transparent);backdrop-filter:blur(14px) saturate(160%);border-bottom:1px solid color-mix(in oklab,var(--border) 60%,transparent)}
.nav__row{display:flex;align-items:center;justify-content:space-between;height:100%}
.nav__brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em}
.nav__brand svg{width:34px;height:34px}
.nav__brand small{font-weight:500;color:var(--fg-muted);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
.nav__links{display:flex;gap:22px;font-size:var(--text-sm);color:var(--fg-muted)}
.nav__links a{position:relative;padding:6px 2px;transition:color .3s var(--ease)}
.nav__links a:hover{color:var(--fg)}
.nav__links a::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--teal);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.nav__links a:hover::after{transform:scaleX(1)}
.nav__cta{display:inline-flex;align-items:center;gap:8px;padding:9px 16px;border-radius:999px;background:var(--fg);color:var(--bg);font-size:var(--text-sm);font-weight:600;white-space:nowrap;flex-shrink:0;line-height:1;transition:transform .3s var(--ease),background .3s var(--ease)}
.nav__cta svg{width:14px;height:14px;flex-shrink:0}
.nav__cta:hover{transform:translateY(-1px);background:var(--teal-strong);color:#fff}
.nav__burger{display:none}
.nav__panel{display:none;flex-direction:column;gap:8px;padding:8px 0 12px;border-top:1px solid var(--border)}
.nav__panel a{padding:10px 0;color:var(--fg);font-weight:500}
.nav__panel.open{display:flex}
@media (max-width:820px){
 .nav__links,.nav__cta{display:none}
 .nav__burger{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;border:1px solid var(--border)}
 .nav__panel{position:fixed;inset:var(--nav-h) 0 auto 0;background:var(--surface);border-bottom:1px solid var(--border);padding:24px;display:none;flex-direction:column;gap:14px}
 .nav__panel.open{display:flex}
 .nav__panel a{padding:10px 4px;border-bottom:1px solid var(--border);color:var(--fg)}
}
/* HERO */
.hero{position:relative;padding:clamp(40px,7vw,88px) 0 clamp(40px,7vw,80px);overflow:hidden}
.hero__bg{position:absolute;inset:0;z-index:0;pointer-events:none}
.hero__bg svg{width:100%;height:100%;display:block}
.hero__grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:clamp(28px,4vw,64px);align-items:center}
@media (max-width:940px){.hero__grid{grid-template-columns:1fr;gap:36px}}
.hero__eyebrow{display:inline-flex;align-items:center;gap:10px;padding:6px 12px;border-radius:999px;background:var(--teal-soft);color:var(--teal-strong);font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:600}
.hero__eyebrow .dot{width:6px;height:6px;border-radius:999px;background:var(--pulse);box-shadow:0 0 0 4px color-mix(in oklab,var(--pulse) 40%,transparent);animation:pulse 2.4s var(--ease) infinite}
.dot--coral{background:var(--accent) !important;box-shadow:0 0 0 4px color-mix(in oklab,var(--accent) 40%,transparent) !important}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.25);opacity:.6}}
.hero h1{font-family:'Fraunces',Georgia,serif;font-weight:500;line-height:1.03;letter-spacing:-.025em;margin:18px 0 22px;display:flex;flex-direction:column;gap:8px}
.hero__name{font-size:clamp(24px, calc(1.2rem + 1.4vw), 34px);font-weight:600;color:var(--teal-strong);letter-spacing:-.01em;font-family:'Inter','Manrope',system-ui,sans-serif;text-transform:none}
.hero__tagline{font-size:var(--text-3xl);line-height:1.06;font-family:'Fraunces',serif;font-weight:500;letter-spacing:-.025em}
.hero h1 em{font-style:italic;color:var(--teal-strong);font-weight:400}
.hero h1 .hl{background:linear-gradient(180deg,transparent 62%,var(--accent-soft) 62%);padding:0 .06em}
.hero__bio{color:var(--fg-muted);font-size:var(--text-lg);max-width:56ch;margin:0 0 16px}
.hero__bio b{color:var(--fg);font-weight:600}
.hero__badges{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0 0 10px;padding:0}
.hero__badges li{font-size:12px;padding:5px 10px;border-radius:999px;background:var(--surface-alt);border:1px solid var(--border);color:var(--fg-muted)}
.hero__badges li a{color:inherit;text-decoration:none;border-bottom:1px dotted color-mix(in oklab,var(--fg-muted) 50%,transparent);transition:color .2s var(--ease),border-color .2s var(--ease)}
.hero__badges li a:hover{color:var(--teal-strong);border-bottom-color:var(--teal-strong)}
/* Portrait */
.hero__portrait{position:relative}
.hero__portrait-wrap{position:relative;aspect-ratio:4/5;max-width:460px;margin-inline:auto;border-radius:28px;overflow:visible;isolation:isolate}
.hero__portrait-wrap img{width:100%;height:100%;object-fit:cover;display:block;position:relative;z-index:1;border-radius:24px;box-shadow:var(--shadow-lg);border:1px solid var(--border)}
.hero__blob{position:absolute;inset:-8% -6% -6% -8%;background:radial-gradient(55% 50% at 15% 15%,color-mix(in oklab,var(--teal) 30%,transparent) 0%,transparent 70%),radial-gradient(60% 55% at 90% 90%,color-mix(in oklab,var(--accent) 34%,transparent) 0%,transparent 72%);z-index:0;filter:blur(2px)}
.hero__pill{position:absolute;z-index:2;background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:8px 14px;font-size:12px;color:var(--fg-muted);display:inline-flex;align-items:center;gap:8px;box-shadow:var(--shadow-lg);white-space:nowrap}
.hero__pill b{color:var(--fg);font-family:'Fraunces',serif;font-weight:500;font-variant-numeric:tabular-nums;font-size:13px;margin-left:4px}
.hero__pill--a{left:-14px;top:12%}
.hero__pill--b{right:-14px;bottom:14%}
@media (max-width:520px){.hero__pill--a{left:6px}.hero__pill--b{right:6px}}
.hero__actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 20px;border-radius:999px;font-size:var(--text-sm);font-weight:600;transition:transform .35s var(--ease),background .3s var(--ease),color .3s var(--ease),border-color .3s var(--ease)}
.btn--primary{background:var(--teal);color:#fff}
.btn--primary:hover{background:var(--teal-strong);transform:translateY(-1px)}
.btn--ghost{background:transparent;border:1px solid var(--border);color:var(--fg)}
.btn--ghost:hover{border-color:var(--teal);color:var(--teal-strong)}
.btn svg{width:16px;height:16px;transition:transform .35s var(--ease)}
.btn:hover svg{transform:translateX(3px)}
.hero__meta{display:flex;gap:26px;flex-wrap:wrap;margin-top:36px;color:var(--fg-muted);font-size:var(--text-sm)}
.hero__meta div{display:flex;flex-direction:column}
.hero__meta strong{color:var(--fg);font-size:22px;font-family:'Fraunces',serif;font-weight:500;font-variant-numeric:tabular-nums}
/* HERO VISUAL */
/* SECTION */
section{padding:clamp(56px,9vw,120px) 0}
.section__head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;margin-bottom:clamp(32px,5vw,56px)}
.section__eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--teal-strong);font-weight:600}
.section__eyebrow::before{content:"";display:inline-block;width:22px;height:1px;background:var(--teal-strong);vertical-align:middle;margin-right:12px}
.section__title{font-family:'Fraunces',serif;font-weight:500;font-size:var(--text-2xl);letter-spacing:-.02em;line-height:1.1;max-width:22ch}
.section__lead{max-width:38ch;color:var(--fg-muted);font-size:var(--text-base)}
/* PROJECTS */
.projects{background:var(--surface)}
.p-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:22px}
@media (max-width:900px){.p-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.p-grid{grid-template-columns:1fr}}
.card{grid-column:span 3;position:relative;background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;gap:18px;transition:transform .5s var(--ease),box-shadow .5s var(--ease),border-color .5s var(--ease);overflow:hidden}
.card--wide{grid-column:span 6}
.card--tall{grid-column:span 3;min-height:340px}
@media (max-width:900px){.card,.card--wide,.card--tall{grid-column:span 2}}
@media (max-width:520px){.card,.card--wide,.card--tall{grid-column:span 1}}
.card:hover{transform:translateY(-3px);border-color:color-mix(in oklab,var(--teal) 40%,var(--border));box-shadow:var(--shadow-lg)}
.card__badge{display:inline-flex;align-items:center;gap:8px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--fg-muted)}
.card__badge i{width:6px;height:6px;border-radius:999px;background:var(--teal)}
.card__badge.b--pilot i{background:var(--accent)}
.card__badge.b--field i{background:var(--pulse)}
.card__title{font-family:'Fraunces',serif;font-size:var(--text-xl);letter-spacing:-.02em;font-weight:500;line-height:1.15}
.card__desc{color:var(--fg-muted);font-size:var(--text-sm)}
.card__meta{display:flex;flex-wrap:wrap;gap:8px}
.chip{font-size:11px;padding:5px 10px;border-radius:999px;border:1px solid var(--border);color:var(--fg-muted);background:transparent}
.card__cta{margin-top:auto;font-weight:600;color:var(--teal-strong);font-size:var(--text-sm);display:inline-flex;align-items:center;gap:8px;padding-top:6px;white-space:nowrap}
.card__links{margin-top:auto;display:flex;flex-wrap:wrap;gap:14px 20px;padding-top:6px}
.card__links .card__cta{margin-top:0;padding-top:0}
.card__cta--ghost{color:var(--fg-muted)}
.card__cta--ghost:hover{color:var(--teal-strong)}
.card__cta svg{transition:transform .35s var(--ease);width:16px;height:16px}
.card:hover .card__cta svg{transform:translateX(4px)}
.card__viz{position:relative;height:150px;border-radius:12px;background:linear-gradient(160deg,var(--teal-soft),color-mix(in oklab,var(--accent-soft) 60%,transparent));overflow:hidden;border:1px solid color-mix(in oklab,var(--border) 60%,transparent)}
.card__viz svg{position:absolute;inset:0;width:100%;height:100%}
/* AI DEMO */
.ai{background:linear-gradient(180deg,var(--bg) 0%,var(--surface) 40%,var(--bg) 100%)}
.ai__panel{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:36px;background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius-lg);padding:clamp(24px,4vw,44px);box-shadow:var(--shadow-lg)}
@media (max-width:900px){.ai__panel{grid-template-columns:1fr}}
.ai__intro h3{font-family:'Fraunces',serif;font-size:var(--text-xl);letter-spacing:-.02em;font-weight:500;line-height:1.15;margin-bottom:14px}
.ai__intro p{color:var(--fg-muted);font-size:var(--text-sm)}
.ai__disclaimer{margin-top:20px;padding:14px 16px;border-left:3px solid var(--accent);background:color-mix(in oklab,var(--accent-soft) 60%,transparent);border-radius:6px;font-size:12px;color:var(--fg)}
.ai__chat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:12px;min-height:360px}
.ai__log{flex:1;display:flex;flex-direction:column;gap:10px;overflow-y:auto;padding-right:6px;max-height:340px}
.msg{max-width:88%;padding:11px 14px;border-radius:14px;font-size:var(--text-sm);line-height:1.5}
.msg.u{align-self:flex-end;background:var(--teal);color:#fff;border-bottom-right-radius:4px}
.msg.a{align-self:flex-start;background:color-mix(in oklab,var(--surface-alt) 85%,var(--teal-soft));color:var(--fg);border:1px solid var(--border);border-bottom-left-radius:4px}
.msg.a b{color:var(--teal-strong)}
.ai__form{display:flex;gap:8px}
.ai__form input{flex:1;padding:11px 14px;border-radius:12px;background:var(--surface-alt);border:1px solid var(--border);color:var(--fg)}
.ai__form input:focus{outline:none;border-color:var(--teal)}
.ai__form button{padding:11px 16px;border-radius:12px;background:var(--fg);color:var(--bg);font-weight:600;font-size:var(--text-sm)}
.ai__form button:disabled{opacity:.5}
.ai__chips{display:flex;flex-wrap:wrap;gap:6px}
.ai__chips button{font-size:12px;padding:6px 10px;border-radius:999px;border:1px solid var(--border);color:var(--fg-muted)}
.ai__chips button:hover{border-color:var(--teal);color:var(--teal-strong)}
.typing{display:inline-flex;gap:4px;padding:6px 4px}
.typing i{width:6px;height:6px;border-radius:999px;background:var(--fg-faint);animation:tdot 1.2s var(--ease) infinite}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes tdot{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-2px)}}
/* TIMELINE */
.tl__list{display:grid;gap:14px;grid-template-columns:1fr}
.tl__item{display:grid;grid-template-columns:120px 1fr;gap:18px;padding:18px 0;border-top:1px solid var(--border)}
.tl__item:last-child{border-bottom:1px solid var(--border)}
@media (max-width:600px){.tl__item{grid-template-columns:1fr}}
.tl__year{font-family:'Fraunces',serif;font-size:var(--text-lg);color:var(--teal-strong);letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.tl__body h4{font-weight:600;font-size:var(--text-base);margin-bottom:4px}
.tl__body p{color:var(--fg-muted);font-size:var(--text-sm)}
/* NEWS */
.news{background:var(--surface)}
.news__list{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media (max-width:900px){.news__list{grid-template-columns:1fr}}
.news__item{padding:24px;background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius);display:flex;flex-direction:column;gap:12px;transition:transform .4s var(--ease),border-color .4s var(--ease)}
.news__item:hover{transform:translateY(-2px);border-color:color-mix(in oklab,var(--teal) 40%,var(--border))}
.news__source{display:flex;justify-content:space-between;font-size:12px;color:var(--fg-muted);letter-spacing:.05em;text-transform:uppercase}
.news__title{font-family:'Fraunces',serif;font-size:var(--text-lg);letter-spacing:-.015em;line-height:1.25;font-weight:500}
.news__snippet{color:var(--fg-muted);font-size:var(--text-sm)}
.news__link{margin-top:auto;color:var(--teal-strong);font-weight:600;font-size:var(--text-sm);display:inline-flex;align-items:center;gap:8px}
.news__link svg{width:14px;height:14px;transition:transform .35s var(--ease)}
.news__item:hover .news__link svg{transform:translate(3px,-3px)}
/* CONTACT */
.contact{background:linear-gradient(160deg,var(--teal-strong) 0%,var(--teal) 100%);color:#fff}
.contact .container{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:40px;align-items:center}
@media (max-width:820px){.contact .container{grid-template-columns:1fr}}
.contact h2{font-family:'Fraunces',serif;font-weight:500;font-size:var(--text-2xl);letter-spacing:-.02em;line-height:1.1;margin-bottom:16px}
.contact p{color:rgba(255,255,255,.75);font-size:var(--text-base);max-width:44ch}
.contact__actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.contact .btn--primary{background:#fff;color:var(--teal-strong)}
.contact .btn--primary:hover{background:var(--accent);color:#fff}
.contact .btn--ghost{border-color:rgba(255,255,255,.35);color:#fff}
.contact .btn--ghost:hover{border-color:#fff;color:#fff}
.contact__meta{display:grid;grid-template-columns:1fr 1fr;gap:18px 32px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);padding:24px;backdrop-filter:blur(4px)}
.contact__meta small{display:block;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.7);margin-bottom:6px}
.contact__meta b{font-family:'Fraunces',serif;font-weight:500;font-size:var(--text-lg);letter-spacing:-.015em;word-break:break-word}
/* FOOTER */
footer{background:var(--bg);color:var(--fg-muted);border-top:1px solid var(--border);padding:36px 0}
.foot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;align-items:center;font-size:var(--text-xs)}
.foot a:hover{color:var(--fg)}
/* Reveal */
.reveal{transition:opacity .8s var(--ease),transform .8s var(--ease)}
.js .reveal{opacity:0;transform:translateY(20px)}
.js .reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.06s}.reveal.d2{transition-delay:.14s}.reveal.d3{transition-delay:.22s}.reveal.d4{transition-delay:.3s}
/* Domain badge */
.brand-domain{margin-left:6px;background:color-mix(in oklab,var(--teal) 14%,transparent);color:var(--teal-strong);padding:2px 8px;border-radius:999px;font-size:11px;letter-spacing:.06em}
/* ABOUT */
.about{padding:80px 0 40px;background:var(--bg)}
.about__wrap{max-width:820px;margin:0 auto}
.about__body{margin-top:22px;display:flex;flex-direction:column;gap:16px}
.about__body p{font-size:var(--text-base);line-height:1.75;color:var(--fg-muted)}
.about__body a{color:var(--teal-strong);text-decoration:underline;text-underline-offset:2px}
.about__body a:hover{color:var(--accent)}
.about__body b{color:var(--fg)}
.about__body em{color:var(--fg);font-style:italic}